<template>
  <div class="cart">
    <h4>全部商品</h4>
    <div class="cart-main">
      <div class="cart-th">
        <div class="cart-th1">全部</div>
        <div class="cart-th2">商品</div>
        <div class="cart-th3">单价（元）</div>
        <div class="cart-th4">数量</div>
        <div class="cart-th5">小计（元）</div>
        <div class="cart-th6">操作</div>
      </div>
      <div class="cart-body">
        <ul class="cart-list" v-for="good in shopCartList" :key="good.skuId">
          <li class="cart-list-con1">
            <input type="checkbox" name="chk_list" :checked="good.isChecked" @click="getChangeOneChecked(good)"/>
          </li>
          <li class="cart-list-con2">
            <img :src="good.imgUrl" />
            <div class="item-msg">{{ good.skuName }}</div>
          </li>
          <li class="cart-list-con4">
            <span class="price">{{good.skuPrice}}.00</span>
          </li>
          <li class="cart-list-con5">
            <a href="javascript:void(0)" class="mins" @click="changeNum('sub',-1,good)">-</a>
            <input
              autocomplete="off"
              type="text"
              :value="good.skuNum"
              minnum="1"
              class="itxt"
              @change="changeNum('input',$event.target.value,good)"
            />
            <a href="javascript:void(0)" class="plus" @click="changeNum('add',1,good)">+</a>
          </li>
          <li class="cart-list-con6">
            <span class="sum">{{good.skuPrice*good.skuNum}}</span>
          </li>
          <li class="cart-list-con7">
            <a class="sindelet" @click="deleteOne(good)">删除</a>
            <br />
          </li>
        </ul>
      </div>
    </div>
    <div class="cart-tool" v-if="shopCartList.length">
      <div class="select-all">
        <input class="chooseAll" type="checkbox" v-model="chooseAll" />
        <span>全选</span>
      </div>
      <div class="option">
        <a @click="deleteCheckedGood">删除选中的商品</a>
      </div>
      <div class="money-box">
        <div class="chosed">已选择 <span>{{checkedGoods}}</span>件商品</div>
        <div class="sumprice">
          <em>总价（不含运费） ：</em>
          <i class="summoney">{{totalPrice}}</i>
        </div>
        <div class="sumbtn">
          <router-link class="sum-btn" to="/trade">结算</router-link>
        </div>
      </div>
    </div>
    <h1 style="height: 50px;text-align:center;line-height: 50px;color: darkgray;" v-else>这里空空的，快去挑选吧...</h1>
  </div>
</template>

<script>
import throttle from 'lodash/throttle';
import { mapState } from 'vuex';

export default {
  name: "ShopCart",
  mounted() {
    this.getShopCartList();
  },
  methods: {
    // 获取商品列表
    getShopCartList() {
      this.$store.dispatch('getShopCartList')
    },
    // 改变商品数量
    changeNum:throttle(async function(type,disNum,good) {
      if (type === 'add') {
        // 加目前没有限制
      } else if (type === 'sub') {
        // 减之后的数量不能小于1
        if (good.skuNum === 1) {
          disNum = 0
        }
      } else {
        // 输入框里面不能输小于1的数量
        disNum = disNum < 1 ? 0 : disNum - good.skuNum;
      }
      try {
        await this.$store.dispatch('getAddGoods', { skuId: good.skuId, skuNum: disNum })
        this.getShopCartList()
      } catch (error) {
        alert('修改失败')
      }
    }, 1000, { trailing: false }),
    // 修改单个选中状态
    async getChangeOneChecked(good) {
      try {
        await this.$store.dispatch('getChangeOneChecked', { skuId: good.skuId, isChecked: good.isChecked ? 0 : 1 })
        this.getShopCartList()
      } catch (error) {
        console.log(error);
        alert('修改单个选中状态失败')
      }
    },
    // 删除单个商品
    async deleteOne(good) {
      try {
        await this.$store.dispatch('getDeleteOne', good.skuId)
        this.getShopCartList()
      } catch (error) {
        alert('删除失败')
      }
    },
    //删除选中商品
    async deleteCheckedGood() {
      let skuIdList = []
      this.shopCartList.forEach(item => {
        if (item.isChecked) {
          skuIdList.push(item.skuId)
        }
      })
      try {
        await this.$store.dispatch('getCheckedGood', skuIdList)
        this.getShopCartList()
      } catch (error) {
        alert('删除失败')
      }
    }
  },
  computed: {
    ...mapState({
      shopCartList:state=>state.shopcart.shopCartList || []
    }),
    // 计算选中数量
    checkedGoods() {
      let num = 0
      this.shopCartList.forEach(item => {
        if (item.isChecked === 1) {
          num +=item.skuNum
        }
      })
      return num
    },
    // 计算选中总价格
    totalPrice() {
      return this.shopCartList.reduce((prev,item,index) => {
        if (item.isChecked === 1) {
          prev += item.skuPrice * item.skuNum
        }
        return prev
      },0)
    },
    // 全选和全不选
    chooseAll:{
      get() {
        return this.shopCartList.every(item=>item.isChecked)
      },
      async set(newVal) {
        console.log(newVal);
        let skuIdList = []
        this.shopCartList.forEach(item => {
          if (item.isChecked != newVal) {
            skuIdList.push(item.skuId)
          }
        })
        try {
          const res = await this.$store.dispatch('getCheckedAll',{isChecked:newVal?'1':'0',skuIdList})
          console.log(res);
          this.getShopCartList()
        } catch (error) {
          alert('修改失败')
        }
      }
    }
  }
};
</script>

<style lang="less" scoped>
.cart {
  width: 1200px;
  margin: 0 auto;
  h4 {
    margin: 9px 0;
    font-size: 14px;
    line-height: 21px;
  }
  .cart-main {
    .cart-th {
      background: #f5f5f5;
      border: 1px solid #ddd;
      padding: 10px;
      overflow: hidden;
      & > div {
        float: left;
      }
      .cart-th1 {
        width: 25%;
        input {
          vertical-align: middle;
        }
        span {
          vertical-align: middle;
        }
      }
      .cart-th2 {
        width: 25%;
      }
      .cart-th3,
      .cart-th4,
      .cart-th5,
      .cart-th6 {
        width: 12.5%;
      }
    }
    .cart-body {
      margin: 15px 0;
      border: 1px solid #ddd;
      .cart-list {
        padding: 10px;
        border-bottom: 1px solid #ddd;
        overflow: hidden;
        & > li {
          float: left;
        }
        .cart-list-con1 {
          width: 15%;
        }
        .cart-list-con2 {
          width: 35%;
          img {
            width: 82px;
            height: 82px;
            float: left;
          }
          .item-msg {
            float: left;
            width: 150px;
            margin: 0 10px;
            line-height: 18px;
          }
        }
        .cart-list-con4 {
          width: 10%;
        }
        .cart-list-con5 {
          width: 17%;
          .mins {
            border: 1px solid #ddd;
            border-right: 0;
            float: left;
            color: #666;
            width: 6px;
            text-align: center;
            padding: 8px;
            text-decoration: none;
          }
          input {
            border: 1px solid #ddd;
            width: 40px;
            height: 31px;
            float: left;
            text-align: center;
            font-size: 14px;
          }

          .plus {
            border: 1px solid #ddd;
            border-left: 0;
            float: left;
            color: #666;
            width: 6px;
            text-align: center;
            padding: 8px;
            text-decoration: none;
          }
        }

        .cart-list-con6 {
          width: 10%;

          .sum {
            font-size: 16px;
          }
        }

        .cart-list-con7 {
          width: 13%;

          a {
            color: #666;
          }
        }
      }
    }
  }
  .cart-tool {
    overflow: hidden;
    border: 1px solid #ddd;

    .select-all {
      padding: 10px;
      overflow: hidden;
      float: left;

      span {
        vertical-align: middle;
      }

      input {
        vertical-align: middle;
      }
    }

    .option {
      padding: 10px;
      overflow: hidden;
      float: left;

      a {
        float: left;
        padding: 0 10px;
        color: #666;
      }
    }

    .money-box {
      float: right;

      .chosed {
        line-height: 26px;
        float: left;
        padding: 0 10px;
      }

      .sumprice {
        width: 200px;
        line-height: 22px;
        float: left;
        padding: 0 10px;

        .summoney {
          color: #c81623;
          font-size: 16px;
        }
      }

      .sumbtn {
        float: right;
        a {
          display: block;
          position: relative;
          width: 96px;
          height: 52px;
          line-height: 52px;
          color: #fff;
          text-align: center;
          font-size: 18px;
          font-family: "Microsoft YaHei";
          background: #e1251b;
          overflow: hidden;
          text-decoration: none;
          &hover {
            color: white !important;
          }
        }
      }
    }
  }
}
</style>